Bell, I.
and Deiters, U.
(2020),
Unphysical critical curves of binary mixtures predicted with GERG models, International Journal of Thermophysics, [online], https://doi.org/10.1007/s10765-020-02743-3 (Accessed May 12, 2026)
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Unphysical critical curves of binary mixtures predicted with GERG models
Published
Author(s)
, Ulrich K. Deiters
Abstract
When applied to asymmetric binary mixtures (e.g., methane + pentane or heavier alkanes, hydrogen-containing mixtures), the GERG equation of state (GERG-2004 or GERG-2008) predicts critical curves with physically unreasonable temperature maxima above the critical temperature of the heavier component. These maxima are associated with physically impossible vaporliquid equilibria. The phenomenon is probably caused by corrections for critical anomalies that were built into the empirical pure-fluid equations of state forming the foundation of the GERG model. These corrections ensure that the model represents thermodynamic data of pure fluids quite well even close to their critical points. For mixtures, however, the corrections can cause artifacts.Citation
International Journal of Thermophysics
Volume
41
Pub Type
Journals
Download Paper
Keywords
critical points, mixtures, thermodynamics
Citation
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Created October 18, 2020, Updated October 20, 2020